Expansible core for curing tires



A. HUETTER.

EXPANSIBLE CORE FOR CURING TIRES.

APPLICATION FILED APR. I5, 1920.

Patented Jam Il, 1921i.

unirse sra-respirare .ANDREW HUETTER, OF DAYTON, HIO, ASSIGNOR TG THE TRE ANB RUBBER CGMPANY, OF AKBGN, HEO, A CORPQBA'ON @E H.

EXEANSIBLE CORE EUR CURING TRES.

Application led April l5, 1920.

To all w lao/1a t may con oef/1a Be it known that l, ANDREW llon'rfrnn, citizen of Austria, residing at Dayton, in the county of Montgomery, State of Ohio, have rinvented certain new and useful Improvements in Expansible Cores for Curing Tires, of which the following is a specilication.

This invention relates to an apparatus for use in vulcanizing pneumatic 'tires7 and is designed to replace the customary fabric and rubber expansible bag. The type of apparatus here shown is a. metallic flexible and expansible bag which will perform the functions of the expansible bag composed of layers of fabric and rubber now used for this purpose and. will be more desirable and less expensive to manufacture.

These and other objects are apparent from an examination of the invention and it will. be evident that changes and rnodilcations may be made Without sacrificing any of the benefits of the invention.

In the drawings Figure l is a cross section through a tire repairing mold showing the core or bag in place.

Fig. 2 is a longitudinal section.

ln the drawings l represents the Vulcan.-

izingr mold or cavity such as is customn used in tire repair shops or factories. "is

the tire casing, the carcass being shown at 3 and the tread at 4l. A pair of bead molding or forming. rings is shown at 5 being shaped on their inner edges to conform to the lower outer edges of the casing; and being held together by bolts 6.

The air bag or expansible core is shown at 7 and is made of flexible sheet of any desirable material. lt has been found that sheet copper is suitable for this purpose7 al though other materials may be found. The outer surface 'of the core is made to conform approximately to the inner surface of the tire casing. fit its inner edge between the beads the bag is formed with e rentrant portion or recess 8 which is curved inwardly making theullag in somewhat liorseshoe form. At one end of the core or bag is provided an infla'ting device, indicated by the numeral 9, which is designed to ne at-- tached to any suitable source of fluid pressure.

In using the improved sectional core'or air bag the parts areassernbled in the rela- Spe'ciceton of Letters Eatent.

.Patented lf Serial No. 373,992.

tion shown in the iilraivings and the pressure is applied to the interior of the core, whereby it is expanded forcing' the tire casing;l in contact with the walls of the mold, the expansion being permitted by the recess or rentrant portion 8.

lhe air bag or expansible core .is superior to those in use at the .present time as, owing to its metallic construction it is not easily damaged. The coro is expansible in a similar fashion to the rubber andv fabric air bag; and performs all the functions of the old style bag. 3i/*lille the construction is shown as applied only to a sectional air bag, such as used in the repair of tire casings, it is obvious that a similar construction may be used for a complete core, such as used in the manufacture of tires.

@ther changes and modifications may be made in the forni of constructioin thebroz'ld invention. lying ini-he construct-i .n of an expansible metallic shell .vliicl'l may be eX- panded by fluid pressure$ the etiorniation of the ree'ntranuportion of the b Y permitting the shell to expand. Such variations in deare obvious to those are intended to be Within the scope of having flexible metallic walls, a rentrant v formation in one of said Walls and. means 'to introduce fluid pressure Within the shell.

e. vuleenizing core comprising; a thin Wall of se ostantially even 'thickness throughout, the outer surface of the Wall cornforinu ingr to 'the shape of the inside of tire cass and a rentrant forniationat the beads of the tire permitting expansion of the core. il vulcanizing core comprising1 a shell. the Walls whereof are exible but inexaensible, a formation within one of said ivalls permitting the shell to expand and means communicating with the interior of iii@ shell to expand the same by .luid pressure o. A. vuicanizing core comprisin" the. walls whereof :1re exible, but immensible5 n portion u1' Enid wullb being Shaped to conform to the inner Surface, of :L tire casing, n rutmnt formatml between the bauds, and means .connected with thv/shell to expand it.

T .v'ulczmzng core comprising sllel? 13s-mmm the wall@ whereof are exble but nextensible, n portion or' mid 11H5 boing shaped uw conform to fh@ inner surface of u Lire casing', :r remrami, irrmuton bvtween the beads, and u1u; Us connected with the shell to expand it bij fluid pressure.

LTLIDREY HUETTER. 

